The Practical Technical Theatre videos are hosting on Vimeo, a web-based hosting platform.
We also offer an alternate hosting platform which you can access by clicking on the link right above any PTT video:
Click on that link and see if the alternate video host solves the issue.
If Vimeo is blocked and the alternate hosting link (above) doesn't help, have your IT department try the following:
Unblock vimeocdn.com, vimeo.com/api, player.vimeo.com
Add vimeocdn.com, vimeo.com/api, player.vimeo.com as Allowed Referrers
Ensure your web filter allows secure (encrypted) requests from vimeo.com
Clear the browser cache (in chrome, safari etc.)
To test the videos, your IT people can visit this page and attempt to play any video. There's no need to log in to access this test page.
If the video plays, then everything should be OK.